<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://unpkg.com/vue@next"></script>
</head>
<body>
    <div id="app">
        <p v-if="isValid">v-if true</p>
        <p v-else>v-if false</p>
        <p v-show="isValid">v-show</p>
        <button @click="switchAction">切换状态</button>

        <br>

        <p v-if="num == 0">num=0</p>
        <p v-else-if="num == 1">num=1</p>
        <p v-else>num!=0&1</p>
        <button @click="changeNum(0)">num=0</button>
        <button @click="changeNum(1)">num=1</button>
        <button @click="changeNum(2)">num!=0&1</button>

    </div>
    
    <script type="text/javascript">
        const app = Vue.createApp({
            data(){
                return{
                    isValid: true,
                    num:0
                }
            },
            methods: {
                switchAction(){
                    this.isValid = !this.isValid
                    console.log('状态',this.isValid)
                },
                changeNum(number){
                    this.num = number
                }
            }
        })
        app.mount('#app')
    </script>
</body>
</html>